Fire the BehaviorSubject with the identical value following a mutation

Question

Fire the BehaviorSubject with the identical value following a mutation

I am working with a BehaviorSubject where I have to make changes through mutation (for reasons beyond my control). I need to trigger the BehaviorSubject for subscriptions whenever there are changes.

Is there another approach I can take instead of using:

  triggerNext() {
        this.uploadFiles$.next(this.uploadFiles$.getValue());
    }

Although it works, I find it lacking in elegance.

angular typescript rxjs

Answer 1

Answer №1

Typically, it is recommended to subscribe to the Subject in order to retrieve its value as utilizing any other method is seen as an anti-pattern (How to get current value of RxJS Subject or Observable?).

However, the approach taken may vary depending on your specific scenario. If you are certain that this.uploadFiles$ will never complete and functions as a "state," sticking with your current method might be more intuitive than implementing the following:

this.uploadFiles$
    .pipe(first())
    .subscribe(val => this.uploadFiles$.next(val));

Answer 2

Typically, it is recommended to subscribe to the Subject in order to retrieve its value as utilizing any other method is seen as an anti-pattern (How to get current value of RxJS Subject or Observable?).

However, the approach taken may vary depending on your specific scenario. If you are certain that this.uploadFiles$ will never complete and functions as a "state," sticking with your current method might be more intuitive than implementing the following:

this.uploadFiles$
    .pipe(first())
    .subscribe(val => this.uploadFiles$.next(val));

Fire the BehaviorSubject with the identical value following a mutation

Answer №1

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